remotely-save/docs/minimal_intrusive_design.md
fyears df2d98272c new sync algo, squashed commit of the following:
commit 692bb794aea5609b9e9abf5228620f4479e50983
Author: fyears <1142836+fyears@users.noreply.github.com>
Date:   Sun Feb 27 17:52:43 2022 +0800

    bump to 0.3.0

commit 77335412ad2da2b5bd1ed5075061a5af006e3c36
Author: fyears <1142836+fyears@users.noreply.github.com>
Date:   Sun Feb 27 17:50:57 2022 +0800

    change titles for minimal intrusive design

commit 2812adebb84344d384749a62acb63fd0c6fd509d
Author: fyears <1142836+fyears@users.noreply.github.com>
Date:   Sun Feb 27 17:30:53 2022 +0800

    remove syncv1

commit 22fc24a76c9851740bbc7c0177d1cb2526e15d8b
Author: fyears <1142836+fyears@users.noreply.github.com>
Date:   Sun Feb 27 17:30:27 2022 +0800

    full notice to any one

commit d56ea24a78f6dc1fbea2740011ee1cea9c403d4c
Author: fyears <1142836+fyears@users.noreply.github.com>
Date:   Sat Feb 26 23:11:14 2022 +0800

    fix test

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Author: fyears <1142836+fyears@users.noreply.github.com>
Date:   Sat Feb 26 21:59:25 2022 +0800

    obfuscate metadata on remote

commit 9b6bf05288af0e52d0f02468e5ac8757f4f896df
Author: fyears <1142836+fyears@users.noreply.github.com>
Date:   Sat Feb 26 21:33:52 2022 +0800

    avoid re-uploading if meta not changed

commit 03be1453764e48e99207f44467ee4d5801072ed8
Author: fyears <1142836+fyears@users.noreply.github.com>
Date:   Sat Feb 26 00:35:52 2022 +0800

    add password condition

commit 7f899f7c2572df3e2a35e16cbdaab94db113f366
Author: fyears <1142836+fyears@users.noreply.github.com>
Date:   Sat Feb 26 00:22:58 2022 +0800

    add decision branch for easier debugging

commit cf4071bf3156356ae6ec3a9cb187c2cb541d1b17
Author: fyears <1142836+fyears@users.noreply.github.com>
Date:   Fri Feb 25 23:40:52 2022 +0800

    change folder error

commit 964493dd998699a1d53018a201637bda192c4baa
Author: fyears <1142836+fyears@users.noreply.github.com>
Date:   Fri Feb 25 23:09:44 2022 +0800

    finnaly remote remove should be working

commit 2888e65452f9c0e1dde6005f012c3ee0a6313c3f
Author: fyears <1142836+fyears@users.noreply.github.com>
Date:   Fri Feb 25 01:18:15 2022 +0800

    optimize comparation

commit 024936951d6180b1296c2a5d56c5bf5d468e9ae7
Author: fyears <1142836+fyears@users.noreply.github.com>
Date:   Fri Feb 25 01:14:44 2022 +0800

    allow uploading extra meta

commit 007006701d536da2b4b46389941980579bbc4e67
Author: fyears <1142836+fyears@users.noreply.github.com>
Date:   Thu Feb 24 01:08:58 2022 +0800

    add logic to fetch extra meta

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Author: fyears <1142836+fyears@users.noreply.github.com>
Date:   Thu Feb 24 00:29:16 2022 +0800

    another way to deal with trash

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Author: fyears <1142836+fyears@users.noreply.github.com>
Date:   Thu Feb 24 00:28:51 2022 +0800

    add return buffer for downloading

commit b8e6b79bc078def2854bc73578b7f520cc39ab34
Author: fyears <1142836+fyears@users.noreply.github.com>
Date:   Wed Feb 23 00:16:06 2022 +0800

    half way to actual sync

commit 90cceb1411b46af9741f2caa3ab8beafaf69c1b2
Author: fyears <1142836+fyears@users.noreply.github.com>
Date:   Tue Feb 22 23:36:09 2022 +0800

    cleaner way to remember the folder being kept

commit c1afb763cc4e0f7905c83e0a8eb20f8ed969a279
Author: fyears <1142836+fyears@users.noreply.github.com>
Date:   Tue Feb 22 00:03:21 2022 +0800

    simplified way to get plans for sync algo v2

commit 5c5ecce39eb3854900f1f5b79c7beb189e78a6a7
Author: fyears <1142836+fyears@users.noreply.github.com>
Date:   Mon Feb 21 23:13:58 2022 +0800

    archive the old sync algo v1 doc

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Author: fyears <1142836+fyears@users.noreply.github.com>
Date:   Mon Feb 21 23:13:14 2022 +0800

    simplify sync algo v2

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Author: fyears <1142836+fyears@users.noreply.github.com>
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commit f9712ef96021dfed4ae33e6c649f78e940b7e530
Author: fyears <1142836+fyears@users.noreply.github.com>
Date:   Mon Feb 21 09:38:09 2022 +0800

    fix sync

commit 9007dcf22ef317dde36ac4f1dd589d05cc8d5cf6
Author: fyears <1142836+fyears@users.noreply.github.com>
Date:   Mon Feb 21 00:54:21 2022 +0800

    fix assignment

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Author: fyears <1142836+fyears@users.noreply.github.com>
Date:   Mon Feb 21 00:28:43 2022 +0800

    draft of sync v2

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Author: fyears <1142836+fyears@users.noreply.github.com>
Date:   Mon Feb 21 00:23:19 2022 +0800

    how to deal with folders

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Author: fyears <1142836+fyears@users.noreply.github.com>
Date:   Sun Feb 20 23:39:16 2022 +0800

    helper func to get parents

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Author: fyears <1142836+fyears@users.noreply.github.com>
Date:   Sun Feb 20 23:31:21 2022 +0800

    add optional ending slash to getFolderLevels

commit 2d67c9b2b941e676588fa43ab289fab79f567e5e
Author: fyears <1142836+fyears@users.noreply.github.com>
Date:   Sun Feb 20 14:44:44 2022 +0800

    update sync algo v2

commit 491ed1bb85759df2411706fd02d740acb5598ce6
Author: fyears <1142836+fyears@users.noreply.github.com>
Date:   Sun Feb 20 14:34:51 2022 +0800

    dry run mode

commit dfd588dcef512ba7dfe760008bcf97138b97e339
Author: fyears <1142836+fyears@users.noreply.github.com>
Date:   Sat Feb 19 23:14:32 2022 +0800

    prettier

commit eae580f882a045ae9df799b816e68c3500704131
Author: fyears <1142836+fyears@users.noreply.github.com>
Date:   Sat Feb 19 23:12:29 2022 +0800

    draft design for sync algo v2
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Markdown

# Minimal Intrusive Design
Before version 0.3.0, the plugin did not upload additional meta data to the remote.
From and after version 0.3.0, the plugin just upload minimal extra necessary meta data to the remote.
## Benefits
Then the plugin doesn't make more-than-necessary assumptions about information on the remote endpoint.
For example, it's possbile for a uses to manually upload a file to s3, and next time the plugin can download that file to the local device.
And it's also possible to combine another "sync-to-s3" solution (like, another software) on desktops, and this plugin on mobile devices, together.
## Necessarity Of Uploading Extra Metadata
The main issue comes from deletions (and renamings which is actually interpreted as "deletion-then-creation").
If we don't upload any extra info to the remote, there's usually no way for the second device to know what files / folders have been deleted on the first device.
To overcome this issue, from and after version 0.3.0, the plugin uploads extra metadata files `_remotely-save-metadata-on-remote.{json,bin}` to users' configured cloud services. Those files contain some info about what has been deleted on the first device, so that the second device can read the list to apply the deletions to itself. Some other necessary meta info would also be written into the extra files.